There are so many apps you don't mention. Not one using the SIP protocol, like Linphone, CSipSimple, Ekiga. Not one using the Tox protocol, like Antox, uTox, qTox, Toxygen, Ricin.
The Tox protocol seems to offer what you ask for. https://tox.chat
There are so many apps you don't mention. Not one using the SIP protocol, like Linphone, CSipSimple, Ekiga. Not one using the Tox protocol, like Antox, uTox, qTox, Toxygen, Ricin.
The Tox protocol seems to offer what you ask for. https://tox.chat